class Point {
  int x,y;
  void setXY(int m,int n) {
    x=m;
    y=n;
 }
}
public class Example4_4 {
  public static void main(String args[]) {
Point p1,p2;
p1=new Point();
p2=new Point();
System.out.println("p1的引用:"+p1);
System.out.println("p2的引用:"+p2);
p1.setXY(1111,2222);
p2.setXY(-100,-200);
System.out.println("p1的x，y坐标:"+p1.x+","+p1.y);
System.out.println("p2的x，y坐标:"+p2.x+","+p2.y);
p1=p2;
System.out.println("将p2的引用赋给p1后:");
System.out.println("p1的引用:"+p1);
System.out.println("p2的引用:"+p2);
System.out.println("p1的x，y坐标:"+p1.x+","+p1.y);
System.out.println("p2的x，y坐标:"+p2.x+","+p2.y);
}
}

